/Engine/Plugins/Runtime/MassGameplay/Source/MassActors/Public/MassActorSubsystem.h
Get mass handle from an actor
[FMassEntityHandle](API\Plugins\MassEntity\FMassEntityHandle) GetEntityHandleFromActor ( const [TObjectKey](API\Runtime\CoreUObject\UObject\TObjectKey)< const [AActor](API\Runtime\Engine\GameFramework\AActor) > Actor )